/ Dictionary / Index R Ruhr: Meaning and Definition of Find definitions for: Ruhr Pronunciation: (roor), [key] — n. a river in W Germany, flowing NW and W into the Rhine. 144 mi. (232 km) long. a mining and industrial region centered in the valley of the Ruhr River. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: ruhr (Thesaurus) Ruhmkorff coil ruin Related Content Daily Word Quiz: censure Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language